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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '112f25c9651e9079cb3b172b4439eb9970c80b0e72fab36120113d97549bda9d' 
  AND token = 'rJAj/RkbdT2kMLhB0FN0sDjN+LUdhKIL3Z8NjldJntg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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