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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '553887eab608c93e5ea88562f63fe1a961b17348ba6a22caaf31f98197ff97af' 
  AND token = 'wh4m1fH4S9oHMcJiH880sq06bHztArP2Tqz4Hbxs4Hw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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