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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '218d20b489de1042a86bd3c3b659da0148779e5fcfe7dcb489effa1bf0fb42dd' 
  AND token = 'wCImf0wImrEi59i+cLADGTTgTQ1Ya9Geyk2VLcey75E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}