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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fb1bff42a7d63e70c1fa2315c298094b6d2d84ed7387b19c2cdc30ba590e782' 
  AND token = '/cj1FCVNCSoLx7AuGqQ9Vf3M3xTfTibdwcMzPW/lcOE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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