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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '637a8f7176a2c9b1309cd884775bc8db7849818d726ffd9752e7359508f5caae' 
  AND token = 'rAiALW75kWzGDB2UpD9/Y0JbA/9e59GSoCgwI4LNFHk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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