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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2e5d5f1919d02101ec924b6ba7378e915b00f99bb61437e6f41c69454c240a9' 
  AND token = 'QbePZ//UFXh1qcI/kux/X5EotxUstvQHQJk2sBEdtDo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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