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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e6042e1804e769fecb6c51f07788fbadeca60ad623c15411453ff5f59cd197b' 
  AND token = 'G/EN3j/Qftw3V3Yuy84V+ifeQsy060SlRlZhx2M0CzA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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