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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee9f3e5c8e68fe1aae9f11f417b7ef34179b42d457bc243aec9796eda760ff6c' 
  AND token = 'SQVVF3rtkrXeGhbFae0N71KSzeqX7lML8V/bzIpYxXQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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