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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2a7ec30d0344f522d14d2c2a32ca4cd6c5bb55d820bd302c4346aa191f63330' 
  AND token = 'JtFcLQ7jbuITbChXFaxlz1R02uk5x7EqsHV+35xJiGY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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