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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '754dc99f450a485c230e68fbd2f089c98984a2c7fb5c643306a316b92cdb2ef8' 
  AND token = '+jK5W31FDsoy5sFaN3wX6lvtYFqx+tyPpxZrUi0c3PA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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