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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff0a0d2711cd2d783df2e22afe69b408a4119de1abb0c59f56c11aea4d3075ae' 
  AND token = 'IoNYra7RKFyNXM9vvmYYtjU2c5eojCWpCqU57g0wmDg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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