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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d26a26bb8f0d10f1c9e6c9a994e1eee87d35114c6218610dafcce995cc37dc3' 
  AND token = 'hujx9A5EZ/LJp7OO2YXO/WG3EN7kCSufVAu1awdK//8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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