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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb6909632e1215e75cfef29eebe396e798d8b6f28db8183da7e4ef4646ada7e7' 
  AND token = '6uSs+WLgvVkbmhO+5deXuBiQWQeZ1OwCutajzU297jc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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