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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '650f18921cd7753db325318fdd3af7d2d22c03d262388ea2138e3b241ef9e682' 
  AND token = 'mKKsir8lLRogto3YW0lbtUJ7+Ka7mtEbLQVW9X5U/8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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