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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c92428bf86cde0187d891a649229783fedf523419a8426b78f17f3526ae7df51' 
  AND token = 'JeLMYP87L3W9tyjD+ovQnPdkYZL6JQxVw0a1he/U9Uo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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