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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '471bb8b5aae037963a42fb9c81d84481ec9e0d91a8d4c9541aef8a435c561a27' 
  AND token = '0qdh4nX8yPoGC1QWfMMSkJcGC7v1+N/DY5EO7o5r+Yw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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