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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61f7049f1a35a066d34deed1be9de76a87b7207462fe989d88ae6cefd03c58bf' 
  AND token = 'zCzvrsXvrt/UDMTDaHza9V2bVstC2gvS8ViYHvZwk2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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