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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14cd8a8c240de75c0c4f6653786317e9398a46f333d684cfea0619e88f0a690a' 
  AND token = 'LRixfNgGVtf6WhNHJqAviGeCMCjjj/RNJyZcczA1CEg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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