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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68cba3726c6822025fd9492e7c137159a2d35014a43942d00fc9389b94f4a946' 
  AND token = '3DuQYSPISjL1b3LOPou51hn6wpWde7ALJoflVeXattY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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