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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '342e5b60edeb090de23d3c8fb5d94e727c717006b15e03472ac1462d30f78631' 
  AND token = 'eeyTJOIPG8ucbvr6QNIJpKxiKXnIGWiyc/mEwHyWvwY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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