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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09e184fc29eaeafc25c772df9f79b92401121b1ae0a426d2ed3efb12b7576bc1' 
  AND token = '5bsZp39q86p0aklR1Nsdvxi6tTxvDxG1JU3tt0dYBE0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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