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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be6abed63027796e7c3a9e28900bac8e7abfbd28970e6afb0c6ccb3e9c7cc9b1' 
  AND token = 'XyJsiC9TkJaLqOqtzJVShZ7Z1OjX2sJUqI5amyGjWqI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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