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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd16f619dbc4c8bbc30962bed1829fc9115f617e0d61799ddb562fdca9895a050' 
  AND token = 'le2xvwHSCGnmPCWpLLdIxblJM8SwXCbYQRRCR3JODUo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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