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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf9ada8ab215bc8ceb5fea08d43adc7dc8bfd919353bde91105d050bddc8c209' 
  AND token = 'Q97qbvbS0nyZPEQc42DVBbw5VQT4L8m61Z1rUq67S6M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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