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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8038a9e4a41345da0a88cb583fac3227cc112b635a52c6463856e5caeb3f5d3' 
  AND token = 'kmTFApt8QG9/KRB3MiAevzFLa9z5oxGj7psLGbHAR5k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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