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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44ad4614f55da375fc2bbef5f2f76d1b0146681091a64fb2a2fd17e4d085feba' 
  AND token = 'SS1XBLtM+iaTut9ZLmrTk1V3jFSSZ/XlwAUogKz40lY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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