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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '876e94bb5e55a94c3eeeee626a042e0e419e5436e2ef387683f109ed2edaa0ea' 
  AND token = 'pRuwPGvJZolaHbBR6nx5uzuSDn5B1uEFqCX9nrD1sfw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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