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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66ec8757ac38859598dec966fe52f90f8a389d91435f0831db637da0215f7c31' 
  AND token = 'Bh6YbJ3KaB4nd8LWHF5xfKoxo+7jSkZ5uUj2/36nKfM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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