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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81d30db53a3e6e3b797563ecc5e3084a46bf58364ae147dac22d4484dfc9a55e' 
  AND token = '6iHkdkfZ6PtMSebpn8G9lzzuxzQLR7M55tLN46d5Ofk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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