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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88ef8bdb9cd620cf33ea6a9f63caddc665c7444560c11b8d771d18ae9c63321b' 
  AND token = 'jl54892fK6MMYBkGO8CsKORzrR/6v2GOZUXlwK6iDyM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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