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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa4f64629f8e0f7aa94a4a814a97fd633cd3e33426013989f5b14023f3b77c6b' 
  AND token = 'KNDDB59ZrT3tfP5CXbRchzD583faOhkNTWBwvf60sHU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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