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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e324608f0a0f886373353ff3fc982a96a94b41d3447eda619efa48b16051cfcd' 
  AND token = 'dV/vrdX60zKj9+bftX3BW08u/vrlNBRSxtEETShEhKo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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