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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '597b4d9b052f6ac4550256dc2d00206aa21b763748bae25da5997b38ba305da4' 
  AND token = 'S2EQp65T4tcB7byB0nxjLuagNcfOK5Hw6iQ4UMGIUUw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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