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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40c151a901fd05851e650d74b46065bd6787e954087598bc74222d696340426f' 
  AND token = 'fZoPiGEPSXDauMFuy2bubgtAinY1QiDT3s4DRtq1jd4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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