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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63212f4a5ef6ef2db605b4a72d489538cdd50eacb64faa74acd7226b54e3669e' 
  AND token = 'LjQMoGsenZs2soAaT9Md/lR9C0HN1OXUObVo7qsRcbw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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