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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13b7c7a87f4c1e1bc8a43a54197811d25af7f5e2d4ea72b3973ae5d881dda16c' 
  AND token = '4eQNFMJblIWBcIVRWW/Iz7M7rM/aueHZ2269wfnMctE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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