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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ce747c1ec42d66b2961989f8a19e360565fca64ca3b83a61c87c7a61d23169d' 
  AND token = 'LFN7yx2oiXpAaGqWWKNJdnYxSLXR3P1RoDSPkvBbftM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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