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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b00499c3f882fe9c068bd393a0e8842186eaecfa80c6f710c53540b5fd0ced5e' 
  AND token = 'kKhw6D510OvYu4OlmdtU1S6ZRt4PM86sfygcVUWfP9M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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