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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f3a8243b42afabe4d0867ecf39c8dc78e68b29c5153b0c4a89ad36cc3a88c5b' 
  AND token = 'H1vherto5ey/Mbu53KJM8Lk5RWnQh87MVW1lRjaPLLI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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