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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c295cdd5dfe3bd2f0eed952d4671168e29a32bdf0df12fa0f1eb153528d4a9cd' 
  AND token = '31pSZrRfm//5HYAP8TQtjQSV0WxKOQi8MJRQm2mf4ME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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