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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fced39501b553b961fd8921bf37e7e1533eb4e383c327faed0dafa87ad653752' 
  AND token = 'TjrXr4ybRp5kmEaBcOT1Yx7j8ZmsKRS11v39tpL+tS0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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