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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90aaee1144792501d173b6b8cc4a7a075e4efcd98798a4634d2196580ca2b900' 
  AND token = 'YSZs2YrkBnMCILN9OXTBbH+kax5YG20ZOtXs0w+wm18=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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