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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aec63a463b2feea66d2244cd463f3e382d261ce91f0b1c631b06f9db36bb22a0' 
  AND token = 'YJxaHLatF5k+ZEFxr8hlBkD8rA+rjLjdhcfSG9se/5s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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