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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f62abb5e22312ace0d9494096f1f9721b0015155b43a2dcfc1fa531dce7c190' 
  AND token = '8IEuy1JWF9xWqb9v1HsF5JDWp8mbBlrl5fdq8z9YIuc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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