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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb1232909afa61645e4da7a480be35bfcb187ce3e6ff0ec8f256bfc9348e5252' 
  AND token = 'LMOkU0p7g2HOHBU+JAqiFu14biwvc03+AiafrvMPvIc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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