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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fea0b4dcc051a55e5a597ad95e1affb70994a5b617dafa72e0538b641b4864c' 
  AND token = 'TM0O0CDHmwyphovtHcA7hIcQ+KWW/EaoknJHoCHtOF8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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