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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4c3cef6a9f67e4bf5a474cee33b495d8ef4d87d2ccea7a97c9f1ac836d9c810' 
  AND token = 'nJX8xMPnvZE29xuD7EuyeftlNaD9o22pKI5YMKXtyWA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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