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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60e65f55db714171f2ebd5e99983c50f66e6f1ea68cdfb83d86dd688876aac65' 
  AND token = 'u59cGfiSv2iQNakG2WUAc3NQd+SeTklFpisGYLeNUIs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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