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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da3919c27abbb5b6d03b829503cd5d604c401dd9b5695d1590c719db2ad3dd6c' 
  AND token = '6DWl6Kz36wpYrfxveNBE15NC0dWMe+ym/5BjtvkLIuI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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