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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f5f6b8d09950e17f749c9110e159c97d6f3ef3e7f5bb8d4862e1e3413f7cc37' 
  AND token = 'D20uechujbz6sFEp9058mXOGmXZTeFBpOR9QrbjWpJA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00126

JSON explain

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