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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b14fa4d9c6977e96e7e5bada505d0b251cff81c58498ebae0dabd97242c43b3d' 
  AND token = 'y08p94cecdOBeWSZ1ocFLoKJo8+uR3Ufk/CWAn396ic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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