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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae1524fbcc6e401c81262cbd7d54308ce46e374e198aac350ad36fe4a8f929dd' 
  AND token = 'XBmrDion77AoKssaA7FI+wPbgMq1+XUCLG24Z86kQzc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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