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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de98d272c8599a645e237b904c540f92b87cf4c498bd769396ddfd86ea3d9606' 
  AND token = '5xUY1Pt73ZNjxQZdygmMefNu9YS6jycIgUT/FPMd+KQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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