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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '943dcdd292688327d70e870793698a77bba903143cb5e3ddcec2843bb4d78e61' 
  AND token = 'fLlx4PgkPMhe3rw7xqXg6h5C25ZrsyHqvl/FEqrhjCY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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