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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '477d1914446ace6bbc59bda3b898c0fb5eb27c6e3cd4734bb12129d88b57c9b7' 
  AND token = 'Oc8RmWlktv2QpyMB82adISHvvQaLD57SFPtaqtgqdtc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

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