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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd91b46b512ac9400d4bd4a361f4a961b4c99dafb6299925893dcde461096f2e2' 
  AND token = '7LUMp36iRpsUyBG6Egriyt8/8fF0RqcUOV9wSKoo00E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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