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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32cd3f74df9a54e16d43c95138a3102746e5ec297376ce5dd9d09f9a0fb42231' 
  AND token = 'p8eDslKpapUDrMcqFH7xMOsNNjYxVgpUSK80cw2ejBQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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