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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a87c4223d8cb4d9e0636b5c0f352433f2d1a9ebcdcc2e63156045f4eb1f0e068' 
  AND token = 'gzmKSBPlLtVkAAICUd7HHbKnVMNvflFffk1laob3biw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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