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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38b60a67e6a43c08ffd96757fe5b8174743cd0618ef711621dc11ac06a57f187' 
  AND token = 'NYhPQl6JzotV0blWMlbk1beIN1SSlhkDm1BpWFF+gRo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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