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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bba6308bbb1ad2dc249184a35e67b7dbdf33a5cb2f4b67b060156d8619e1b2af' 
  AND token = 'QsQo4/s3A0DNZnhlSDxuQtbAdLBrDEa08p+eGSmu4rc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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