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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2250391060599d8b49d97853c56421aabec4aacd38adb642df611d6d62e4dff' 
  AND token = 'nH5U3PcSeU+63RSSLtRpJ2Xza1ox0eizb8amdkmo9lA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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