SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb4510934a509bc35152f7038c7e42752ae56dd3ebcf7c9d19273a158eb56fc5' 
  AND token = '6IU2M4D8yG+HvohxZkxEqr7zNyWKa/KF9KNDnzzWHIw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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