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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '964a8e8cee5555e0603e1b3fe0931dd00112e3a75b3c3fe2c9ee611c81b8e7fc' 
  AND token = 'CfWbQDth9jdDqI6OSI15lWE7GDes8tbisVg1td6U1gs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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