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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06f9b9edc70d935340bdff214dbb5a6a251c8b8bd19d3901a9d8e2bbe658c2ae' 
  AND token = 'NhzoAikgxHDhdLVPffepPwHpeaDw9dSNKN9mq7738Tg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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