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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7f2439f1bb968534fc2b359570afbcfa5b5f8f005c4a7de31625ab7006cf581' 
  AND token = '2EGtAnl9EaB64J1p+I1IJwJv4l5/+/JZbjoReRPdLfs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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