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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b5cea2b6ed353696c9e83410fd942e34b804b5708234e763531891388faa6ad' 
  AND token = '3EhCjbr+efo9u78EGmBQWPcucaSNRij6c2IC5jI1s3M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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